Method of drawing sheet-glass.



No. 822,212. PATENTED MAY 29, 1906/ J. H. LUBBERS.

METHOD OF DRAWING SHBE'E GLASS.

APPLICATION FILED JAILIZ, 1903.

4 sums-sum 1.

No. 822,212. PATENTED MAY 29, 1906 J. H. LUBBBRS.

METHOD OF DRAWING SHEET GLASS. 'APPLIGA'TION FILED IANJZ, 1903.

' 4 SHEETS-SHEET 2.

INVENTOR wn'rNEssEs PATENTED MAY 29, 1906. J. H. LUBBERS.

METHOD OF DRAWING SHEET GLASS.

APPLIOATION IiLED JAN. 12, 1903.

4 SHEETS-SHEET 3.

WITNESSES INVENTDR To a) w/wm it may concern:

. 'UNITED. s rns JOHN- LUBBERS, or ALLEGHENY, PENNSYLVANIA, Assrenon TO JAMES A. CHAMBERS, TRUSTEE, or rir'rssua rnunsrnvaura.

METHOD oF- .Awme SHEET-"GLASS. I

Be it known that I, JOHN H. LUBBERS, of Allegheny, in the; county of Allegheny and State of Pennsylvania, have invented a new. and useful Method of Drawing Sheet-Glass, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in wh1ch I Figure 1 is a vertical cross-section through a furnace and drawingchamber constructed in accordance with my invention.- F 2 is a longitudinal vertical section throng the leer and drawing-chamber. Fig. 3 is a sectional plan view of the apparatus. Fig. 4 is a sectional-side elevation. Fig. 5 is a detail view showing the lifting mechanism for. the

pot or trough, and Fig. 6 is a detail of a.

double cooling-pipe I employ.

My. invention relates to the drawing of glass articles, such as sheets, and is designed to provide an improved method therefor.

The invention relates to an improved manner of filling and discharging the drawin potortrou h, to an improved manner of aw ing a p urality of sheets simultaneously to avoid Warping, and to the manner of annealing the glass. Y

n the drawings, 2 represents a forehearth or extension of a tank 3, in which the glass rests at about the level indicated in Fig; 4. In this forehearth is provided a dipping-ladle 4, which normally rests in the positionshown in Fi 4, in which a slot 5 in the ladle allows the g ass to enter it, while its discharge-nozzle 6 rests upon another tilting trou h 7. .The ladle 4'is provided with a lower epending rib or projection 8, which when the ladle is lifted causes the glass on the lower side of the ladle to drip back into the bath. I thus prevent the glass from entering the hinge o" PlV': otal joint to freeze therein and prevent proper movement. The trough 7 has a depending portion 9, which hooks over the inner en of the outlet or tap-hole 10, which is downwardly inclined to hold the trough 7 in inclined position when the receiving-pot 11 is lowered. The ladle is tilted by means of bars which are inserted .through holes in the side walls 12, which holes are normally closed by plugs or refractory slides 13. The bars Specification of Letters Patent. Application filed January 1 ,1903. Serial No. 133,860.

into the trough 7 and thence into the pot 11, which at this time isin the lowered horizontal position. indicated by'dotted lines.

The pot 11 is of, eneral rectangularpan Fatented May 29, 1906. j

shape, is made of re actory material, and is preferably mounted upon vertically-movable mounted on a transverse support 17, carrie by the piston-rods of motive cylinders 18'. The posts 16 are similarly supported, and

lof

bottom 20 of a actuating one or both of the sets of'cylinder's the pot may be movedvertically in parallel lines or tilted to discharge its contents into a ,60 refractory posts 15 and 16, thepost 15 bein small receptacle 21 after the drawing operation. w

The drawing-framey22 is provided with corner- 'des 23, whichen age 'de-posts 24 at t e corners of the eer-c an'iber or drawing-chamber 25, which-"- extends ,upwardly above the pot-chamber, andth'e'endbars of the drawin frame are rov'ided with a series of vertical s otsi'ri whic seat the par-'-' allel bars 26, carrying the-tongs 27, between which the bait of glass or other material 28- is secured. The frame maybe raised and lowered by suitable means, such as flexible connections 29, extending up over' pulleys above the leer-chamber.

vided swinging or sliding shields 30, of re ac 32 extending through the side walls and con- At the sides of the pot-chamber are I ronected with a water inlet and outlet. The end tube portions may be turned by the operator to swing the shield down and cover the pot or to swing them back into the position shown, where-they rest during drawing, cutting off the heat from the forehearth, the pot. at this time being raised against the top plate 33.

To chill the sheets ator near the drawingpoint, I provide a series of double watercooled pipes 34, which extend between the baits and along the outside of the outer baits.

Each water-pipe is supplied with water through a flexible connection 35 at one end with a header 36, water passing out at the other end into another similar header-37, .and a pipe of lar er diameter surrounds the water-pipe and 0 '11s the sheets. This prevents dripping of water from sweating, and the outer pipes are preferably of brass or noncorrosive material and may have centering devices to hold the inner pipes central. This also prevents chilling of glass when the pipes are brought together.

In Fig. 2 I show the upper part of the drawing-chamber, with a part of the leer. In this figure, 3Sis the first compartment of the lecr, which is separated from the drawing-chainber by a sliding door 39, movable sidewise on rollers 40, and this eoi'npartment is separated from the next compartment bya similar door 11. The leer is made up of a series of these compartments, connecting with each other above the partitions and below the roof 42, and the compartments are heated by separate gas-burners, so that their temperature may be regulated to give the different temperatures desired in the diflerent chambers. The leer is provided with longitudinal stationary,bars 43 and with endwise and vertically movable bars 44, mounted on rollers 45 'in a manner similar to that of a usual rod-leer. The movable bars may be shoved into the vdrawing-chamber beneath the supportingbars 26 and between the tongs, the supporting-bars being lowered upon the leer-bars, which are then moved to carry the set of sheets into the first leer-chamber. The rollers 4.5 may be mounted upon rocking shafts 46, as shown in Fig. 4., which are raised and lowered by link connections 47 with upper rock-shafts 48.

In order to preheat the pieces of glass or other material forming the baits, I preferably provide in the outlet-flue 49, leading from the top of the drawing-chainber, two sets of wheels 50, upon which are arranged movable bars 51, upon which the bars 26, carrying the clamps or tongs 27, may rest at their ends. A set of the baits is thus heated, and after the bars with the drawn sheets have been taken into the leer from the drawing-frame the upper bars 51 are moved forward to carry the new set of baits into the upper part of the drawing-chamber. The drawing-fratnc is lifted up until the bars .26 enter the slots in the end bars. The bars 51 are then drawn back, and the new baits are ready to be lowercd intothc glass-bath to draw a new set of sheets.

' The operation is preferably as lipllows: The ladle and trough 7 being in the position shown in Fig. 4, the pot is lowered into position shown in dotted lines, thdtrough 7 tilting down. The ladle is then tilted to discharge its contents of-glass into the trough and the pot. The pot is then preferably lifted in parallel lines, the shields being in horizontal lowered position to protect the glass until it is of the proper temper. l/Vhcu ready for drawing, the shields are swung back. the drawing-frame is lowered until the set of baits enters the bath, and the frame is then gradually raised to draw theslfeets upwardly within the chamber. From the pot-chamber the sheets move up into the drawing-cham ber above, which is inclosed to prevent the sheet from breaking. After the desired length of sheets is obtained the drawingframe may be stopped, the, end-supp orting bars 52 for the water-pipes 34 are lowered,

and these pipes are shoved together to bring them in contact with the lower end portions of the sheets. The pot is then lowered in parallel lines, and the flame beneath the pipes melts oli' the'sheets and severs them from. the

glass of the bath. During the drawing operation the outer sheets serve to protect and equalize the heat of the inner sheets, and thus prevent their warping, and for-this reason the drawing of a plurality of sheets at the same time forms an important part of my invention. After the sheets are drawnv and severed I preferably tilt the pot, after a reheating, if necessary, to discharge the glass into the small receptacle 21, and thus get rid of the faulty portion of glass remaining on the surface of the glass remaining in the pot. The

drawing-tools with the sheets depending. therefrom are then lifted from the drawing frame and the batch of sheets taken to the first leer-chamber. The drawing-frame is then moved up to take another set of baits and when the pot is again charged is lowered I and the operation repeated.

The advantages of my invention result from the simultaneous drawing of a plurality of sheets, from the manner of feeding the glass into the pot and discharging theimpuritics from the pot after drawing, from the simple and effective arrangement for changing baits and feeding the sheets into the leer, the arrangement of the chilling devices, &c.

Many changes may be made in the form and arrangement of the parts withoutdeparting from my invention.

I clai1n-- l. The method of forming glass sheets consisting in simultaneously drawing a plurality of the sheets from a common bath of molten glass upwardly within an inclosed atmosphere common to all the sheets; substantially as described.

2. The method of drawing sheets, consisting in feeding glass into a separate pot or receptacle within a chamber, and simultaneously drawing a series of sheets upwardly within the inclosed atmosphere of the chamber; substantially as described.

3. The method of drawing glass sheets consisting in sinmltancously drawing aseries of sheets upwardly within a common dri'twingchamber, and then passing said sheets through a. gradua tr-decreasing tcunwrature; substant ially. as described.

4. he method of forming glass sheets con' sist ing inlowering ascries of baitsinto a glassbath, simultaneously raising the baits and drawing the series of sheets, simultaneously chilling each sheet at or near drawing and drawing the within an inclosed atmos here common to 5 all said sheets; substantia y as described. 5. The method of forming glass sheets, which consists in simultaneously drawin from a pot a series of sheets into an inclosec l atmosphere common to all the sheets, then discharging from the pot the impure portions of the remaining glass, recharging the pot, and then drawing another series of sheets; substantially as described.

6. The method of forming glass sheets, which consists in simultaneously drawing a series of sheets into an inclosed atmosphere common to all the sheets, suspending the sheets in adjacent parallel planes,.and then carrying them fiatwise through a leer; sub- 20 stantial y as described.

sheets upwardly the point ofmosp 7. The method of drawin glass sheets consisting in lowering a series 0 baits into a common molten bath and simultaneously drawing the baits upwardly here common to all the sheets, whereby the outer sheets protect the inner sheets from warping; substantially as described.

I 8. The method of forming glass sheets consisting in simultaneously drawing a series of sheets upwardly within an inclosed atmoshere common to all the sheets, whereby the within an inclosed atouter sheets protect the inner sheets from warping; substantially as described.

In testimony whereof I have hereunto set my hand.

' J. H. LUBBERS.

Witnesses:

L. A. CONNER, Jr., I H. M. Conwm. 

